I left my plato plugged in to charge over night, like I have every night for the past 8 months. Now the screen is stuck with the full battery symbol on it. I have tried plugging and unplugging it and removing the battery, no changes. When I hit the fire button the normal display (watts, battery life, etc) comes up, but as soon as I let go the full battery symbol comes back. I have no clue how to fix this and any internet searches have come up blank. Help!